Gear-grinding machine



July 7, 1925.

A. L. WILDER I GEAR GRINDING MACHINE 2 sheets-S 1 vENTqR I mmwud ATTORNEY July 7, 1925.

A. L. WILDER GEAR GRINDING MACHINE Filed April 50 1923 2 Sheets-Sheet 2 amiss??? 1/ ATTORNEY Patented .luly "Y, 1925.

ARTHUR L. WILDER, OF WETHERSFIELD, CONNECTICUT, ASSIGNOR T0 PRATT & WHITNEY COMPANY, OF NEW YQRK, N. Y., A CORPORATION OF NEW JERSEY.

GEAR-GR INDIN G MACHINE.

Application filed April 30,1923. Serial No. 835,593.

To all whom it may concern:

Be it known that I, An'rirun L. W'rnnnn, a citizen of the United States, residing at Viethersfield, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Gear- Grinding Machines, of which the following is a specification.

This invention relates to gear grinders and in particular to a grinder provided with two oppositely disposed grinding wheels adapted to engage. opposite sides of dit ferent teeth.

An object of the present invention is to provide a construction of gear grinding machine enabling a large number of identical gears to be rapidly ground in a relatively simple form of machine. .l'tnother object of the inventionis to provide a construction providimg wide range of adjustment of parts to adapt the machine for widely difthere-pt types and sizes of gears.

Another object of the invention is to provide means for constantly rotating the work holding spindle and to provide means to actuate the abrasive wheels upon slides so that they will correctly engage successive teeth on the gear blank to generate involute tooth curves.

Another object of the invention is to provide special means for guiding the mo venieni's of the ivl'ieels. those means being in the torn: of slides disposed to move at right ann es'to cucli other, one oi the. slides prof rab beingsuperposed upon the other. 'ilhese slid ire. actuated to move the wheels by cngagi .it of a nuister gear on the w rk suindle with the toothed periphery M an ea gated opening, mouned in one of the slid trund e oln'ect of the invention is to proo a "iusu-hine' operating upon the same I"l:f'li!l principle d fin d in the application -F H. l). Tanner, Serial LIo. 544,176, filed liiurr fh "h, i922. l i

With these and other objects in View, my

invenliln consists in the features of condrurtion and operation set forth In the followingspecification and illustrate-.1 in the accompanying drawings.

in. the :u-i-ompanying drawings annexed hereto and forming. a part of this specification, 1' have shown my invention embodied in a winding machine for spur gears but it will. he understood that certain fea ures of.

the'invention may be otherwise embodied, or adapted for gears of other types, and that the drawings are not to be construed as defining-orlimiting the-scope 0t this'in vention, the claims appended to this spccilication being relied upon for that purpose.

In the drawings:

Figure 1 is a plan view of the completeinachine.

Fig. 2 is a vertical sectional view taken on line 22 of Fig. 1.

Fig. 3 is a vertical sectional view ta er. at right angles to Fig. 2.

Fig. 4 isa plan view of the parts controlling the movements of the wheel mounting slides.

In the above mentioned drawings, I have shown but one modification of the invention which is now deemed preferable but it is to be understood that changes and modi' fications may be made within the scope of the appended claims to adapt the mechanism for other types or sizes of gears without departing from. the spirit of the invention.

Briefly, my invention in its broadest aspect comprises the following principal parts: lii st, a base; second, a vertically sup ported rotatable spindle; third, :1. master gear thereon; fourth, means on the spindle adapted to support and rotate a work ar her; filth, a large horizontally disposed ,slide mounted upon ways so that it may be moved forward and rearward; sixth, an other slide mounted to more upon and at right, au 'lcs to the first slide; and seventh,

indepenocntly adjustable slides carrying! the wheel heads each being provided with a rotatable wheel spindle and an abrasive wheel and driving means therefor.

Rcferrii'ig more in detail to the figures of the drawings, I provide a base 10 hav iug, approximately in the. center thereof, a vertically disposed support 11 rigidly secured to the base 10 and providing a heat"- ing for a rotatable spindle or shaft 12. This spindle 19. is adapted to be continu ously rotated by any convenient means such as by the shaft,13 within the base 10 0011-, nected to such spindle by bevel gears 14. The shaft 13 may be rotated by a suitable pulley or by any other suitable power means.

On the upper horizontal surface 18 of the base are provided ways. 19 in which mag operate edoveteiled pro ection 2003i o large slide 21. This slide 2 preferably, rests upon the major portionof the base of the machine and provides the support for all of the wheel. mounting'meens. The upper surface of slide'2l is orovidedwith a suitable guidewiy, in the form. of 'arprojection 22 extending at right angles to tie dovetailed projection on its lower sun face. Supported on guidewey 22 iso l1ori-.- zontslly disposed slide extending completely across machine" Slide 23 as well as slide 21 ere-provided with central openings through which the spindle supporting member 11 and the spindle 12 extend so that these slides may move about through limited distances,

On this upper slide are mounted suitable individual wheel. supporting slides which may be adjusted longitudinally on slide 28 by suitable screws 255 as shown in Figs. 1 and 52 to position them for operating on gears of different diameters. slides 25 are mounted swivelling wheel beads 27 which may be clamped in any adjusted angular position upontbe wheel slides E35 by the clamping bolts 28 ds shown. The swivelling beads 27 ere, 1n turn, pro-' vided with motors 30 which may pieced in driving connection witb t'oe wheel. s nndles 31 by means of suitable belts 32 31i the lower surfaces of the swivelllng beads ,sr small ways 34 adapted to permit limited axial adjustment of the wheel heads 27. The swivellin; heads 27 together with the Wheels 35 may be moved axially of the spindles 31 by screws file -which may rotated by linnd wheels so. dles 31 are the abrasive wheels eecl'i adapted to contact with the work upon one of their plane radial surfaces. J Festcned to opposite sides oi the base 1 upon suitable supports 3G- provided therefor is an arch '3'? extending completely across the machine. This, in its mid position, is provided with an adjustable plunger 38 which isdirectly in alignment with the vertical rotating spindle l2 previously referred to. This plunger 38 and the spindl IQ-are provided respectively with centers 39 andlfiwhich provide means for suitably mountingthe work arbor 41 and the work. blank A between them so that the blank may be rotated in a fixed In thisway, rotation of the spindle provides means to rotate the blank A in accordance with the rotation of the work spindle l2 and about a fixed axis.

Detachnbly fastened in time upper end of the vertical spindle l2 a master 45. this being of exactly the some ili meter; pitch and number of teeth as the gear blanks A which are to be grormd As -this nmtier gear 45 must be chosen witbx particular r erence to the being-"ground, it is made,

On the spinreadily removable so that other master gears may be substituted therefor when gears of di'frerent types 'ondsizes are to be ground.

This master gear so is edepted to contact with geezteeth 46 formed on time perlpliery of an elongated elliptical opening provided The form of this tooth portions have short sections having teeth of "rack form. These are indicated at 48 and extend between the points marked a on the perifihery of the opening. The ends of and in one direction and then in directions at right angles thereto, and in all other directions so that the mastergenr 45 will always remain in contact with some ortion of the periphery of its toothed ellipticgll opening formed in the plate 4-7. Also, as the wheels 35 are mounted on the upper slide 23 they will. partalreof the combined movements of this as well as of the lower'slide. flue to the wheels being mounted won the lower. slide 2l,[tl1ey will be alternately moved into and out of engagement with teeth on the blank A and, whilethey are retained in contact will; the blank, tile blimk will be in eiliect rolling past themes if it were being rolled upon or along arack. In this way, itovolnte toothed curves will be formed upon the gear blank. I 1 During operation the work engaging sur faces of the wheels 35 are adjusted by means of the 26 and 3 so that they arekdisposed in elignment with the flanksurfaces of the rock 'tee'tli on the plate 47. One of the sbmsive surfaces is in alignment with one side of one of these teeth and the other cient for it to be engaged by all of -tlie'teeth in the plate l7 mounted on the nope! slide nphery 1s generelly elliptical but is such t at opposite in the toothed path in plate Q? will cause the abresive-wheels' fi to contact with o posits sides or difierentteeth. Each of t me wheels 35 will be advanced into and withteeth on the gear blank A. This action will take place duringe relstlve-rollmg move-: ment of the master gear 45. and the elongated drawn out of contact'with opposite sides of internal gear formed by the teeth onplate 47.

The result of this actionfibereforewillbe the formation of involufe' curves on the teeth v 1 I of the blank contacted with by the wheels.

Itwill be seen also that if the toothed pa riphery of the-plate. LT- lms a nnmberdf teeth incommensurate with the number of teeth in the master gee-r 45 -31116 .oftbe blank being ground, then each SdGE&lVe IBV0l-iI-d y the relative nd 23 carrying pletc revolution to due to the en ligament of the master gear lo with the entire periphery of the toothed opening in the plate l7 takes place wi': master gear and blank rotate tlHc-l' l than a complete revolution. "the ,ot, position of the. blank A therefore. a? successive cycle of operations, will \"ll QCt inmaxingot" the blank A relative to the wheels 35. in nine: is required and continuous rotation of the spindle. l2 and parts connected thereto will completely grind involute tooth curves upon each of the teeth in the blank A.

in operation, after the blank A has been mounted in position on the spindle 12 and the wheel l'ieads 25 adjusted, the rotation of this blank will cause each of the wheels to contact therewith. Also, during operation to oilect feeding movements of the blank rel ZlVB to the Wheels, the wheel heads 25 may be advanced slightly by means of the sore To retain the slide 23 toward either ex- CJGWE" (it its movement to resiliently hold the ole 35 alternately in contact with the Work, a detent is provided. This is porn 3 shown and resiliently forced tormeans of a spring 51. Preferably war the 50 may be slidably mounted in a projection 52 formed integrally on the slide 21. By these means lateral movement of the slide 23 causes the'detent 50 to bear against opposite sides of hardened pin 53 thus cans a slide :25 tobe held in a position to cause'engagement of the wheels 35 with the gear being ground.

hat claim is:

l. l't gear grinding machine comprising in combination, a base, a work supporting and rotating spindle mounted thereon, a master gear on. said spindle, two superposed slides on said base movable respectively at right angles to each other, a member on the upper slide having an internal toothed periphery, an abrasive Wheel adjustably mounted on said upper slide, and means to rotate the spindle while said gear is retained in engagem at with the teeth on said member and said ides are actuated to alternately engage and the wheel with a blank on said It ar-grinding machine com rising in cc ubinon, a base, a work supporting and rotating spindle n'iounted' thereon, a master gear on said spindle, two superposed slices on said lj ase movable respectively right angles each other, a member on the r r slid having an internal toothed per a {Nation which has teeth or" r f LOI'EII, an abrasive wheel adjust-ably mounted this way nospecial indexing mocha:

iphe'ri',

n'ieans to rotate the.

is retained in enh on said member and to alternately engage master gear engages the on said member.

-5. 'tar wing machine compris mg 211 (Ull'lllllltlblilll a base, a Work support ing and rotating spindle thereon, a master ,e' ar on said spindle, two superposed slides on said base movable respectively at right angles to each other, a member fixed to said upper slide having an internal toothed peripher'y, the number of teeth in said periphery being incommensurate with the number of teeth in the master gear and. the gear blanlobeing operated on, an al'u'asive wheel adjustably mounted on said upper slide, and means to rotate the spindle whereby said master gear engages the teeth on said member having the toothed periphery and said slides are actuated to alternately engage and disengage the wheel with successive teeth on said gear blank.

l. A gear grinding machine comprising in combination, a base, a work supporting and rotating spindle mounted in fixed position thereon a master gear on said spindle, two superposul slides on said base movable respectively at right angles to each other, a member fixed to aid, upper slide having an internal toothed periphery, a portion of which has teeth. of rank form, the number of teeth in said periphery being incommensurate with the number of teeth in the gear blank being'operatcd on, an abrasive wheel.

adjustably mounted on said upper slide, and means to rotate the spindle whereby said master gear is retained in engagement with the teeth on said member having the toothed periphery and said slides are actuated to alternately engage and disengage the wheel with successive teeth on said gear blank while said master gear engages said teeth of rack form.

5. A gear grinding machine comprising in combination, a base, a work supporting and rotating spindle mounted in fixed position thereon, a master gear on said spindle, two superposed slides on said base movable respectively atright angles to each other, a member fixed to said upper slide having an internal toothed periphery, a portion of which has teeth of rack form, the number of teeth in said periphery being incomme r surate with the number of teeth in the gem blank being; operated on, an abrasive wheel adiustably mom i aid upper slide and it blank upon one a and means to whereby said master gear rement; with the teeth on the toothed periphery actuated to alternately 5;; and disengege the wheel with 23110-- e teeth on said gear-blank while said master gear enga 'es the teeth of rack form. 6. Agent grin 'ing machine comprising in combination, base, a, vertically dispesed work supporting and reteting spindle thereon, a master gear on said spindle, two superosed horizontally mevehle slides on said use movable respectively at rightengles to veach other, a member on said upper slide having an inteimal teethed periphery of elongated. form adapted t0 engs, the teeth of said master gear eypositelg disposed abrasive Wl'ieels on the upper slide, and

means tfllflildte the spindle whereby a gear blank en said spindle will. he alternately engaged andfdisengeged by said Wheels end the engagement at the master gear with the toethe'd periphery of the member on the up per slide will setuete said slides to cause the engagement and disengagement at said wheels with the gear blank.

7. A gear grinding machine comprising 1n combmatwme base, a work supportmg and rotating spindle thereon, a master gear on said spindle, two superposed slides on' said base movable respectively at ri ht angles te-eeeh other, a member on sai riphery of the r slide having a toothed periphery adapte tof' slides to cause said engagement and disengagement, and resilient means acting upon one of the slides to hold said wheels hlternetely in contact with the blank.

In testimony whereof, I hereto atfix my signature. 7

" ARTHUR L. WILDER. 

